CAUSE ANALYSIS OF TUBE BURSTS OCCURRED ON FINAL-STAGE SUPERHEATER OF BOILERS AND PREVENTION MEASURES THEREOF

XIAO Guohua1; WANG Chunming2; TIAN Xiao1; LI Yimin1; YANG Baixun1 1.Xi'an Thermal Power Research Institute Co Ltd

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CAUSE ANALYSIS OF TUBE BURSTS OCCURRED ON FINAL-STAGE SUPERHEATER OF BOILERS AND PREVENTION MEASURES THEREOF

更新时间：2025-09-28

- CAUSE ANALYSIS OF TUBE BURSTS OCCURRED ON FINAL-STAGE SUPERHEATER OF BOILERS AND PREVENTION MEASURES THEREOF
- Thermal Power Generation Vol. 41, Issue 3, Pages: 78-82(2012)
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 华能德州电厂
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK223.32
- Published：2012
- 稿件说明：
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XIAO Guohua1, WANG Chunming2, TIAN Xiao1, et al. CAUSE ANALYSIS OF TUBE BURSTS OCCURRED ON FINAL-STAGE SUPERHEATER OF BOILERS AND PREVENTION MEASURES THEREOF[J]. Thermal power generation, 2012, 41(3): 78-82.
DOI：

XIAO Guohua1, WANG Chunming2, TIAN Xiao1, et al. CAUSE ANALYSIS OF TUBE BURSTS OCCURRED ON FINAL-STAGE SUPERHEATER OF BOILERS AND PREVENTION MEASURES THEREOF[J]. Thermal power generation, 2012, 41(3): 78-82. DOI：

摘要

通过宏观形貌、成分分析、低倍观察、金相组织、硬度检验、室温拉伸和冲击试验等对某电厂2×362MW机组锅炉末级过热器爆管原因进行了分析。结果表明

爆管I(材质T22)断裂与焊道设计不合理、母材管金相组织及力学性能不合格有关;爆管II(材质T91)断裂系焊接工艺执行不当

焊缝熔合线处存在夹渣和焊缝硬度偏高所致。对此提出了顶棚穿墙管与密封板的角焊缝应尽量避开密封板对接焊缝

改进密封板与管的焊接结构

减小定位块厚度等建议。

Abstract

Through macroscopic observation

chemical compostion analysis

low-magnification inspection

metallographic examination

hardness test

and tensle and impact tests under room temperature

the causes leading to tube burst occurred on final-stage superheater of boilers for 2×362 MW units in first-phase project of one power plant have been analysed.Results shows that the breakage of tube 1(T22) on final-stage superheater was related to improper design of the welding seam

the metallographic structure and mechanical property of tube materials being unqualified;the rupture of tube 2(T91) on final-stage superheater was caused by improper execution of welding technology

making slag to be existed on fusion line and high hardness in welded seam.For this

it is recommented that the angle-welding seam of roof-entrance tube and the sealing plate have to keep away from the butt-welding seams on sealing plate as possible

improving the weld structure of sealing plate and tubes

decreasing the thickness of locating block.

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